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| author | Ihar Hrachyshka <ihrachys@redhat.com> | 2017-05-18 12:41:19 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-05-21 13:26:45 -0400 |
| commit | 6fd05633bdafc0ae6ec0d55e61af10780d4d3530 (patch) | |
| tree | 831a02bc8d919ba4db70d0f5a35179dadddcf0f6 /net/ipv4/arp.c | |
| parent | 34eb5fe07831458cf8238d54c1fc847dedeaf68c (diff) | |
| download | linux-6fd05633bdafc0ae6ec0d55e61af10780d4d3530.tar.gz | |
arp: decompose is_garp logic into a separate function
The code is quite involving already to earn a separate function for itself. If anything, it helps arp_process readability. Signed-off-by: Ihar Hrachyshka <ihrachys@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/arp.c')
| -rw-r--r-- | net/ipv4/arp.c | 35 |
1 files changed, 23 insertions, 12 deletions
diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c index 053492af8a6e..ca6e1e6c1496 100644 --- a/net/ipv4/arp.c +++ b/net/ipv4/arp.c @@ -641,6 +641,27 @@ void arp_xmit(struct sk_buff *skb) } EXPORT_SYMBOL(arp_xmit); +static bool arp_is_garp(struct net_device *dev, int addr_type, + __be16 ar_op, + __be32 sip, __be32 tip, + unsigned char *sha, unsigned char *tha) +{ + bool is_garp = tip == sip && addr_type == RTN_UNICAST; + + /* Gratuitous ARP _replies_ also require target hwaddr to be + * the same as source. + */ + if (is_garp && ar_op == htons(ARPOP_REPLY)) + is_garp = + /* IPv4 over IEEE 1394 doesn't provide target + * hardware address field in its ARP payload. + */ + tha && + !memcmp(tha, sha, dev->addr_len); + + return is_garp; +} + /* * Process an arp request. */ @@ -844,18 +865,8 @@ static int arp_process(struct net *net, struct sock *sk, struct sk_buff *skb) It is possible, that this option should be enabled for some devices (strip is candidate) */ - is_garp = tip == sip && addr_type == RTN_UNICAST; - - /* Gratuitous ARP _replies_ also require target hwaddr to be - * the same as source. - */ - if (is_garp && arp->ar_op == htons(ARPOP_REPLY)) - is_garp = - /* IPv4 over IEEE 1394 doesn't provide target - * hardware address field in its ARP payload. - */ - tha && - !memcmp(tha, sha, dev->addr_len); + is_garp = arp_is_garp(dev, addr_type, arp->ar_op, + sip, tip, sha, tha); if (!n && ((arp->ar_op == htons(ARPOP_REPLY) && |